Is Magic Square

MagicSquare.java

public class MagicSquare {

	// O(N + N*M) = O(N * M)
	public boolean isMagicSquare(int[][] arr){
		int diag1Sum = 0, diag2Sum = 0;
		var rowSize = arr.length;
		var colSize = arr[0].length;

		for(int i = 0; i < rowSize; i++){
			diag1Sum += arr[i][i];
			diag2Sum += arr[i][rowSize-1-i];
		}

		if(diag1Sum != diag2Sum){
			return false;
		}

		for(int i = 0; i < rowSize; i++){
			int rowSum = 0, colSum = 0;
			for(int j = 0; j < colSize; j++){
				rowSum += arr[i][j];
				colSum += arr[j][i];
			}
			if(rowSum != colSum || rowSum != diag1Sum){
				return false;
			}	
		}
		return true;
	}